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Resource Library

Vertical Turbine Pump Shaft & Bearing Types, Fits and Clearance

  • November 2018
  • Number of views: 3582
  • Article rating: 4.0
Webinar recording

This presentation covers:

  • Shaft material and specs
  • Shaft coupling types
  • Machining for shafts
  • Bronze, plastic, graphite and cutlass bearing options
  • Bearing clearance concerns and reference data 
  • Bearing housing fits

Two case history examples point to need for caution with metal spray

  • June 2018
  • Number of views: 2349
  • Article rating: No rating

Two case histories point out the need for caution when working with metal sprayed shafts:

  • Example 1: When measuring the bearing fit shaft size, the micrometer didn’t feel right; mushy, not solid, although the journal was very close to the specified size. After using two micrometers to experiment with one of these frosted fits, it was discovered that the measurement on one micrometer changed when tightening down the other micrometer and vice versa.
  • Example 2: The bearing journals on a large armature began to fail while the armature was coming up to speed in balance stand.

Sleeve bearing clearance depends on many factors

  • June 2016
  • Number of views: 3794
  • Article rating: 2.0
Trade press article — Plant Engineering

“What’s the proper clearance between a shaft and the sleeve bearing it rides in?” Chances are each of us has a rule of thumb for this, probably related to shaft diameter.

Failure Analysis of Shafts and Fasteners

  • June 2014
  • Number of views: 1238
  • Article rating: No rating
Convention presentation

This technical paper, presented at the 2014 EASA Convention, will help you understand how and why shafts and fasteners fail.

Identifying the most appropriate shaft repair method

Opposite drive end bearing journal, drive end bearing journal and bent shaft

  • April 2012
  • Number of views: 2496
  • Article rating: 5.0

When a shaft is in need of repair, often the frst step is to determine the corrective method required. Economics and best practices are typically significant factors in the decision-making process in selecting the method of repair. The types of shaft repairs that will be dealt with here are: opposite drive end bearing journal, drive end bearing journal and bent shaft. The objective is not to detail the repair processes, but to identify the most common methods appropriate to the types of repair and considerations associated with each method.

Techniques for Straightening Pump Shafts

  • March 2011
  • Number of views: 1475
  • Article rating: No rating
Webinar recording

The slender dimensions of many pump shafts make them susceptible to distortion, which affects pump performance and reliability. This presentation provides a methodical approach and effective techniques for measuring and correcting shafts which are bent or twisted. 

Tips for safe and effective shaft removal

Save time, effort with these proven procedures and suggestions

  • April 2009
  • Number of views: 1172
  • Article rating: No rating

Like most maintenance and repair tasks, a successful outcome is generally predicated on good planning and preparation. The first steps in the process are often the most critical.

Relationship of torque to motor shaft size

  • January 2007
  • Number of views: 1904
  • Article rating: 5.0

Have you ever wondered why the shaft of an electric motor is often larger than that of the driven equipment? One reason for this is that the standard shaft sizes specified for the standard NEMA frame machines are larger than the minimum required, as we will see in the examples herein. Manufacturers tend to design using an ample safety factor. Given the dire consequences if a shaft breaks, that is understandable. Even so, the difference between a T and TS shaft can raise questions for those unfamiliar with mechanical design. It is important that the shaft is large enough to (a) transmit the required torque without exceeding the maximum allowable torsional shearing stress for the shaft material, and (b) prevent torsional deflection, or twisting, during service. All this, with a substantial safety factor.

Demagnetizing motor shafts to prevent bearing failures

  • October 2005
  • Number of views: 3233
  • Article rating: 3.0

There are a number of ways that the shaft of an electric motor can become magnetized in service. The most likely culprit is electric current through the motor and shaft, either from internal dissymmetry, welding or from a variable frequency drive. It can also be caused by electrical faults in the system, or even a lightning strike. If enough current does pass through the shaft, then it can remain magnetized, even after it is taken off line. The problem is that when a shaft is magnetized, it can further lead to bearing failures, unless something is done to eliminate the residual magnetism. The first reason for bearing failures is that the residual magnetism can cause shaft currents, which can quickly lead to bearing failures. But in addition, a magnetized shaft will attract bits of metal to the bearings. This reduces bearing life because it damages the bearing surfaces.

Understanding factors that cause shaft failures

  • March 2004
  • Number of views: 1392
  • Article rating: 5.0

Shaft failures are not an everyday occurrence, but when they come in, it can be an interesting challenge to determine the cause of failure. Regardless of what caused the shaft to fail, what actually happens when it bends or breaks? To understand shafts and why they fail, you need to understand the relationship between stress and strain for steel.

Getting The Most From Your Electric Motors

Getting The Most From Your Electric Motors - coverThis 40-page booklet provides great advice for obtaining the longest, most efficient and cost-effective operation from general and definite purpose electric motors.

This booklet covers topics such as:

  • Installation, startup and baseline information
  • Operational monitoring and maintenance
  • Motor and baseline installation data
  • How to read a motor nameplate
  • Motor storage recommendations



EASA/AEMT Rewind Study

EASA Rewind Study cover

The Effect of Repair/Rewinding on Premium Efficiency/IE3 Motors
Tests prove Premium Efficiency/IE3 Motors can be rewound without degrading efficiency.


ANSI/EASA AR100-2020

ANSI/EASA AR100-2015 cover

Recommended Practice for the Repair of Rotating Electrical Apparatus
This is a must-have guide to the repair of rotating electrical machines. Its purpose is to establish recommended practices in each step of the rotating electrical apparatus rewinding and rebuilding processes.



EASA Technical Manual

EASA Technical Manual cover

Revised May 2021
The EASA Technical Manual is the association's definitive and most complete publication. It's available FREE to members in an online format. Members can also download PDFs of the entire manual or individual sections.